Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de7c079c1316cd5…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 01:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c87ad00b88504e19f0431d1d7aea159 SHA-1: d27321a1801fb1ef3b171ebf84fe07f10b70a4ca SHA-256: 6de7c079c1316cd55c23f521c0f0c505e6aedc50fa956380c3f0c0356d3898f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces the conclusion that the document's primary purpose is to lead users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.peltonfell.org.uk/ckfinder/userfiles/files/85183696155.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8890e1f312---53836673633.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/26281607682.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbaa969ab0---jimipupesu.pdfIn PDF document text
    • https://areicon.com/images/file/bunipoven.pdfIn PDF document text
    • https://congnghethucpham24h.com/upload/files/13912048428.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9dec72b34---xuruvazonebatowititet.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/31302818213.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/47991599818.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083a89fab133---patadivinofededoj.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/47358614235.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/bezafixafimarapefovalolus.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/mewitudaxezesubukoju.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/luxebazezuwusurup.pdfIn PDF document text
    • https://tavio.ru/files/file/mixixorasoxedoxevubedelub.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/31660934098.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/39234272198.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/lebavokegesimenegazewo.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/17a8cab4c3c8ca4db1f7ce4f95823bd9/55917046456.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/56608546637.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/95905722407.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3d082ddbf---99246327359.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/61055174821.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a11242ef5b3e15f54cc8a03bd49fa178/23670306130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=men%27s+health+cover+model+workout+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE9 16060 bytes
SHA-256: 3c6dfc570b62ac7dec75053e0be2246b519384212c51db2eda7145cc3b3f95ec
font_01_sfnt_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 11164 bytes
SHA-256: f5c546e179bb27c3148ed32cf196ae5f9c88afec2ce4b5854d8b2ccffd7c803e
font_02_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1